FT: In Russia and the U.S.the terror attack in Boston and the Tsarnaev brothers’ involvement in it has caused a storm of debate and speculation. Many are talking about "unanswered questions" and "black holes" in this story. Is there anything that you personally find strange?

J.-Fr. R: The most important "black hole" is the lack of objective information about the time that Tamerlan spent in Russia. We haven’t received data on whether he entered into contact with extremists in Chechnya or Dagestan, or whether he was admitted to a training camp. I don’t rule out the possibility that such information will pop up at some stage from Russian sources. But I find it very interesting that that the Russian government, being in possession of information that Tamerlan was heading to the Caucasus in order to join a training camp – something they had earlier warned the American FBI about – allowed him to pass unobstructed into the Caucasus and to stay there for so long. [my tr.]